Processing Machinery
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PVDF Excessive Processing Temperature Decomposition Releasing HF
Fenómeno do problema
【Problem phenomenon】After the barrel temperature exceeds 280-300℃, the melt turns yellow and brown, there is a pungent odor on site, and equipment corrosion intensifies
Análise das causas
PVDF begins to decompose at about 300℃ and releases toxic hydrogen fluoride gas, with 316℃ as the decomposition onset temperature; residence in high-temperature zones and temperature control drift cause the actual melt temperature to exceed the limit, and the decomposition products are both toxic and corrosive
Solução
Set each zone temperature not to exceed the 280℃ upper limit and calibrate the melt temperature by actual measurement; focus on preventing overtemperature in the nozzle zone; shorten the residence time to 2-5 minutes; provide ventilation and HF protection on site, and shut down for investigation upon any unusual odor
Conclusão principal
280℃ is the red line for PVDF processing; overtemperature releases HF that injures people and corrodes machines, and actual melt temperature measurement is a must; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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